It's just a matter of volatility. If a stock drops by 15-20% once a month, a correction is not called a collapse. If it never moves more than 2-3% per day, a 15

It's just a matter of volatility. If a stock drops by 15-20% once a month, a correction is not called a collapse. If it never moves more than 2-3% per day, a 15% drop causes panic. BTC is by far the most volatile asset at the moment (excluding other crypto currencies and some exotic real currencies). I think the reason people talk about crashes so quickly is that no one has a clue what's going on. Is it a broad-based move? Is it a few speculators? Is it a conspiracy? For stocks, at least the regulator knows very quickly who sold and if there's something fishy going on. For BTC, no one knows which makes it more confusing.